JUAREZ >> Two gunmen interrupted and opened fire at a party at a private home late Sunday night in Juárez killing 10 people, including a 6-year-old girl and a woman.

The shooting occurred in Loma Blanca, a town in the Juárez Valley east of the city, police said.

As of Monday night no arrests have been made and the investigation is in full force, Chihuahua state special prosecutor Jorge González Nicolás said during a press conference at the site of the massacre.

The investigation is being conducted by federal, state and local police as well as the Mexican Army. González Nicolás said.

Goinzález Nicolás said Mexican officials will ask the U.S. to help in the investigation, mostly to provide intelligence.

At first, González Nicolás said it was believed that there was only one shooter, a young man. But witnesses have since told investigators that at least two shooters were involved.

State investigators have secured more than 30 spent casings fired from two different AK-47s.

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González Nicolás said that after the attack the gunmen fled the scene toward Juárez in the same vehicle they drove to the house. No motive for the killings has been released.

The incident was reported around 8:30 p.m. Sunday.

Of the 10 people killed, eight were men, one was a woman, along with the 6-year-old girl. The group was celebrating their team's victory in a local baseball game. About 30 people were at the after-game party, Mexican media reported.

According to the Chihuahua General's Attorney's office, nine people died at the scene and another one died at a Juárez hospital.

The incident is one of the biggest massacres in the area since the 2010 killing of 15 people, mostly teens, in an attack on a birthday party at Villas de Salvárcar, a working-class neighborhood south of Juárez.